Can't we just change the 2 strings ``INVALID_FILENAME_TITLE`` and ``FILE_AREADY_EXISTS`` to take a parameter? e.g.

```
StringUtils.format(Strings.INVALID_FILENAME_TITLE, Strings.FILE)
...
StringUtils.format(Strings.FILE_ALREADY_EXISTS, Strings.DIRECTORY, StringUtils.breakableUrl(data.rslt.name))
```

We would probably want to tackle the ``ERROR_DELETING_FILE`` message as well in the same way.